Polyacrylamide is widely used in water treatment applications; therefore, proper dissolution and usage are of critical importance.
First, clean water must be used for dissolution to prevent the introduction of impurities that could compromise performance. The water temperature should ideally be maintained below 40°C; excessively high temperatures can lead to polymer degradation, thereby reducing its efficacy.
The polyacrylamide should be sprinkled slowly and evenly into the agitated water to prevent the formation of large clumps. The stirring speed should not be too rapid, as excessive shear forces can damage the molecular chain structure. Typically, the stirring speed is maintained between 100 and 300 revolutions per minute to ensure complete dissolution.
The standard dissolution concentration ranges from 0.1% to 0.3%-that is, adding 1 to 3 grams of polyacrylamide per liter of water. The dissolution process typically takes 30 to 60 minutes, continuing until the solution becomes transparent and free of visible particles.
During application, the dosage should be adjusted based on the specific characteristics of the water being treated. The optimal dosage can be determined through small-scale laboratory trials, after which the chemical is added proportionally and gradually to the water requiring treatment. Continuous stirring is required during the addition process to ensure thorough mixing of the chemical with the water, thereby maximizing its water treatment effects-such as flocculation and sedimentation. Note that the dissolved solution should not be stored for extended periods; it is best prepared immediately prior to use.
